Underscores are just bad. Stick to dashes.

下划线只有一个糟字可言，坚持使用破折号。

The deal underscores the revival in shipping.

此宗交易的重点是复兴航运业。

Using underscores improves readability to a large extent.

使用下划线在很大程度上改善了可读性。

Let's change all the vowels into underscores in Listing 9.

如清单9所示，让我们将所有的元音字母替换为下划线。

The lawsuit underscores rising tension between Apple and Google.

这起官司凸显出苹果和Google之间的关系日趋紧张。